The main hazards of tongue piercing are the following: First, it is easy to cause bacteremia, because the general level of disinfection of the tongue piercing place is not high, the tongue piercing itself there is a certain amount of bacteria, and easy to cause cross-infection, so that patients suffer from infectious diseases, such as hepatitis B, AIDS or syphilis, is very dangerous. Second, the tongue is a more sensitive part, the tongue nail is likely to cause very serious pain, but also affect the chewing function. Thirdly, if you don’t pay attention to oral hygiene after the tongue nail, it is very easy to cause repeated infection of the tongue and even lead to tongue necrosis. Therefore, doctors do not recommend patients to have tongue piercing because it is harmful but not beneficial.